The younger characters in Encanto like Antonio would be excited. He loves stories and new ideas, so Mirabel fanfiction would be like a new adventure for him. He might want to share it with his animal friends. And Dolores, with her ability to hear everything, might already know about the fanfiction. She could be either intrigued or a bit worried depending on how the fanfiction is being received by the rest of the village. If it's causing a stir, she might be concerned about the family's reputation, but if it's positive, she would likely be quietly supportive.
The Naruto fandom would probably react very negatively. Fans are used to seeing Naruto as a hero, a symbol of hope and growth. A fanfic that portrays him as a slave goes against the very essence of what Naruto represents. There would be a lot of criticism on social media platforms, and many fans might even call for the fanfic to be removed or boycotted.
If the fanfiction incorporated the family's magic in new and creative ways, some characters might be delighted. For example, if it showed Mirabel having a new form of magic related to her ability to bring the family together, the family members might see it as a positive expansion of their story. However, some might be skeptical. Abuela Alma might question if it goes against the family's established magic traditions.
They might be really surprised. Some characters could be flattered by the positive portrayals in the fanfiction. For example, Mirabel might be happy to see different interpretations of her story and how she's seen as a hero in some fics.
There would be a portion of fans who are very against it. They are so used to the idea of Sakura and Sasuke being a potential couple that any deviation from that would seem wrong to them. They might feel that it goes against the 'canon' in a way, even though it's a fanfic.
The Naruto fandom would likely be very divided. Some fans might be intrigued by this unique and unexpected plot twist, seeing it as an interesting exploration of an alternate Naruto universe. However, many fans would probably be quite shocked and even appalled, as it goes against the traditional understanding of the characters and the series.
Some fans might be really sad about it. They love the idea of Sasuke and Sakura together as a couple and see their relationship as a symbol of hope and growth. So, divorce fanfiction goes against their ideal view of the couple.
Encanto is an original story. Disney's team of writers and animators came up with the concept and brought it to life on the big screen. It's not a adaptation or retelling of another story.